How to work around the different behaviour of std::vector between gcc 4.7 and 4.9?

I have something that can be compiled in gcc 4.9, but failed in gcc 4.7.

It is a class which has move constructor, but I set its copy constructor to private:

class Option
{
public:
    Option(const std::string& name_long,
           char               name_short,
           const std::string& group,
           bool*              value_store,
           int32_t            flags,
           const std::string& option_desc);
    // and several similar constructors

    Option(Option&& other);

private:
    Option(const Option& other);
};

The issue occurs when it is called by vector's emplace_back() function:

// options is a std::vector<Option>
options.emplace_back("help", 'h', OPTION_GROUP_MISC,
                     &opt_show_help, htio2::Option::FLAG_NONE,
                     "Show help and exit.");

This successfully compiles and works well by gcc 4.9, but gcc 4.7 claims a two-screen-long error, claiming that its copy constructor is private:

In file included from /public/yx/works/writing_tcrklass2/src/TCRklass2-1.90.0-Source/src/tcrk2/App.h:4:0,
                 from /public/yx/works/writing_tcrklass2/src/TCRklass2-1.90.0-Source/src/tcrk2/App.cpp:1:
......
/public/yx/works/writing_tcrklass2/src/TCRklass2-1.90.0-Source/src/tcrk2/App.cpp:58:47:   required from here
/usr/local/include/htio2/OptionParser.h:188:5: error: ‘htio2::Option::Option(const htio2::Option&)’ is private
In file included from /usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/bits/move.h:57:0,
......
/usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../include/c++/4.7.2/type_traits:762:43: error: within this context

As some of my users has very old system, which is probably using old version of compilers, I really want to know if is there any way to work around it.